package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;
    /**
     * 新增菜品和对应的口味数据
     * @param dishDTO
     */
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //菜品表中插入一条数据
        dishMapper.insert(dish);
        //插入数据库后，数据库分配了主键值，给了id赋值DishMapper.xml写了业务
        Long dishId = dish.getId();

        //口味表中插入n条数据
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
//        dishFlavorMapper.insert(dishFlavors);
        if(dishFlavors!=null && dishFlavors.size()>0){
            //向口味表中插入n条数据
            dishFlavors.forEach(dishFlavor->{
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(dishFlavors);
        }
        return ;
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        //开始使用Thread分页
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> pages=dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(pages.getTotal(),pages.getResult());
    }

    /**
     * 菜品删除
     * @param ids
     */
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //是否存在起售中的商品
        for(Long id:ids){
            Dish dish=dishMapper.getById(id);

            if(dish.getStatus()== StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }

        }
        //首先循环遍历,查询是否关联套餐，左外连接进行查询，查询数量
        List<Long> setmealIds=setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!=null && setmealIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //如果>0 切不为空久进行对dish和气味表的删除
//        for(Long id:ids){
//            dishMapper.deleteById(id);
//            dishFlavorMapper.deleteByDishId(id);
//        }
        //优化删除方案，不要在数据库中使用循环的方法
        //delete * from dish where id in (?,?,?)
        //批量删除菜品
        dishMapper.deleteByIds(ids);
        //批量删除菜品口味
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品所有信息
     *
     * @param id
     * @return
     */
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish=dishMapper.getById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> dishFlavors=dishFlavorMapper.getByDishId(id);

        //将查询到的数据进行封装到VO对象
        DishVO dishVO=new DishVO();
        BeanUtils.copyProperties(dish,dishVO);

        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 修改菜品
     * @param dishDTO
     */
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish=new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品
        dishMapper.update(dish);
        //修改菜品口味(首先删除所有口味数据然后添加口味数据)
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        List<DishFlavor> flavors=dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0){
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品起售、停售
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id){
        Dish dish=Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

    }

    /**
     * 查询菜品和口味数据
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        //创建List<DishVo>
        List<DishVO> dishVOList=new ArrayList<>();

        //首先根据分类id查询菜品数据
        List<Dish> dishList=dishMapper.list(dish);
        //根据菜品id查询口味数据
        dishList.forEach(dishItem -> {
            //dish.getId(); dish表中的id是dish_flavor的dishid
            List<DishFlavor>dishflavorList=dishFlavorMapper.getByDishId(dishItem.getId());
            //创建DishVO
            DishVO dishVO=new DishVO();
            //封装进去
            BeanUtils.copyProperties(dishItem,dishVO);
            dishVO.setFlavors(dishflavorList);
            //添加进dishVOList列表
            dishVOList.add(dishVO);

        });
        //封装成dishVO数据

        return dishVOList;
    }

}
